›› 2017, Vol. 44 ›› Issue (1): 194-200.doi: 10.16431/j.cnki.1671-7236.2017.01.027

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Antigen Epitope Peptides and Immunogenicity Analysis of E. coli O157: H7 Ivy Protein

PAN Yan1,2, LIN Min-ling3, LI Jun1,2, YANG Wei1,2, CHEN Ze-xiang1,2, XIE Yong-ping1,2, PENG Hao1,2, HU TING-jun3   

  1. 1. Guangxi Veterinary Research Institute, Nanning 530001, China;
    2. Guangxi Key Laboratory of Veterinary Biotechnology, Nanning 530001, China;
    3. College of Animal Sciences and Technology, Guangxi University, Nanning 530005, China
  • Received:2016-07-06 Online:2017-01-20 Published:2017-01-19

Abstract:

To evaluate the feasibility of synthetic polypeptides O157:H7 Ivy146-157 as a vaccine antigen, a bioinformatics method was employed to analyze the secondary structures, hydrophilicity plot, flexibility plot, surface probability plot and antigenic index of the Ivy. A B-cell epitope peptide sequence was identified and synthesized. BALB/c mice were immunized with Ivy146-157, antibody titers and splenic lymphocytes proliferations in mice were tested. The results showed that the antibody titers were 1:6 400 after immunized mice three times. And the native Ivy protein of O157:H7 R14 strain was identified by polyclone antibody Ivy146-157. The MTT assay results indicated the splenic lyphocytes were increased after immunized polypeptides Ivy146-157, and had significant difference with the control group (P<0.05). These results indicated that polypeptides Ivy146-157 could induce a strong humoral and celluar immune respond, and it would provide a theory as a vaccine antigen for further researches.

Key words: EHEC O157:H7; Ivy; polypeptides

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